RU72051U1 - TECHNOLOGICAL DRYING COMPLEX - Google Patents

Abstract

1. Technological drying complex containing a drying chamber, building structures, heat insulating elements and pumping equipment, characterized in that it is equipped with a heat ventilation unit forming a double-ring vertical air circulation and forced supply and exhaust ventilation due to its location in the drying chamber between the block stacks of the processed material, while containers used for building structures and heat-insulating elements are two in two so that the space between them forms the loading volume of the drying chamber, and pumping and boiler equipment are placed in their internal premises. 2. Technological drying complex according to claim 1, characterized in that it is made in the form of dialable modular elements.

Description

The proposal relates to the woodworking industry and is intended for drying lumber with simultaneous utilization of timber processing waste and generation of heat energy.

There are many constructive innovations of the last decades, mainly related to the developments of Bollman, Hildebrand, Valmet, Schilde, Vanicek, as well as domestic TsNIIMOD, GIPROdrev, which formed the classic technology of wood drying. Its success determines the almost complete dominance of the global equipment market.

Currently, lumber drying plants are widely known, classified as convective drying chambers with a roof-mounted fan group and vertical air circulation, manufactured by Brancoin, Koetter, BIGonDRY, Seccea, Secotherm, Baschild, Muhlbock, Lesmash-SPb, Uraldrev-Into, etc. [1 -3].

A significant drawback of this type of installation is the limited usable capacity. An increase in the usable capacity of batch type drying chambers is subject to physical limitations in height, and most importantly, in the depth of lumber loading. Thus, a relatively safe loading height cannot exceed 5 m (4 stacks), and a loading depth of more than 5 m requires an increase in fan pressure to purge the aerodynamic network and improve the system of false ceilings and screens. The useful capacity of such drying chambers with a span of up to 6.6 m is about 60-80 cubic meters.

The closest technical solution is the installation for drying lumber, made in the form of a drying chamber, consisting of a housing made of a heat-insulating airtight frame; forced ventilation equipment

air circulation through lumber and heaters; supply and exhaust equipment for the exchange of air between the chamber and the external atmosphere; electrical equipment, process control systems, as well as engineering equipment: pumping, piping, air heaters [4; Wood handbook. FPL-GTR-113. 1999, 463 p.ch. 12, p.9.].

The disadvantage of the prototype is the low useful capacity of the drying chamber, the lack of its own boiler module associated with drying chambers with a common control system, which is associated with some energy losses of the working agent.

The technical task and the technological result of this proposal is to further improve the design of the drying complex to increase capacity, inclusion in the energy supply unit, reducing construction costs due to modularity of installation and increasing productivity, as a result of a more efficient distribution of the working agent flow.

The specified technical task and a positive effect are achieved due to the fact that the technological drying complex (TSC) is made in the form of dialable modular elements based on containers installed two on top of each other, so that the space between them forms the loading volume of the drying chamber, and inside the containers contains ventilation, pumping, electrical equipment with a control system, a boiler room, a control room, as well as storage and auxiliary rooms: TSK also includes building structures and thermal insulation Suitable elements; TSK contains one or several drying chambers equipped with a heat ventilation unit (TBB) forming a double-ring vertical air circulation and forced supply and exhaust ventilation, while the drying chamber is divided into two symmetrical cavities, each of which contains a block-stack of the processed material, and the TBB is installed between them.

The proposed technological drying complex is shown on graphical materials, where:

figure 1 shows a section of a drying chamber with a double-ring vertical air circulation;

figure 2 shows a General view of the TSC, consisting of two chambers with shear gates;

Figure 3 shows a section A-A of Figure 2 TSC;

figure 4 and figure 5 shows the heat ventilation unit.

The technological drying complex shown in the graphic materials contains one or several drying chambers 1, which are composed of containers 2. The thermal enclosure of the chambers is formed by containers forming two side walls, and heat-insulating panels 3 forming the front, rear walls and the roof of the chambers. The containers, installed in pairs (figure 2), form the finished premises for the installation of boiler room 4 and pumping equipment, as well as for technical and household needs, while ensuring a high level of thermal insulation of the drying chambers. Sliding gates 5 are made of insulating panels and in the closed position provide a tight fit to the containers and the front farm. The heat ventilation unit 6 (Figs. 4, 5) is installed in each drying chamber, being, in addition to the main technological purpose, a supporting farm and a support for structural beams. It consists of fans 7, which provide the necessary pressure difference for the formation of a double vertical circular movement of the air mass, effective heat transfer on the surface of the air heaters 8 and the supply and exhaust ventilation 9. The supply and exhaust ventilation system consists of a group of aerodynamically balanced channels. To achieve high performance and accuracy of the mode of drying cards, servo drives with a proportional control law are used. The bimetallic heaters included in the TBB have a highly developed surface optimized for wood drying chambers. Each chamber is loaded with stacks of 10 pre-laid boards, and two block stacks are formed.

11 (figures 1 and 3). For loading, a frontal forklift 12 with a lifting capacity of 5 t or more is used.

Technological drying complex operates as follows. From separate stacks of lumber, two block stacks 11 (FIG. 1) are formed up to the level of the tube sheets of the heaters 8 so that there are corridors of air collectors along the gate and the back wall, as well as between the block stacks. These air collectors provide the necessary dynamic pressure and pressure distribution during the formation of a double-ring vertical air circulation.

The wood drying technology is based on the use of step modes, i.e. a set of parameter values and several processing methods: heating, heating, drying, steam humidification, conditioning, cooling. When implementing the drying method, the dosed portion of the steam-air stream is removed from the chamber, replaced by atmospheric air, mixed with the stream circulating in the chamber, which is sent to the heaters and then to the wood, giving it heat and again saturated with steam.

Heating and hot water supply to TBB 6, as well as return water, are carried out from boiler room 4, located in container 2. The heating capacity of the boiler room for one chamber, calculated according to the recommendations of GIPROdrev, is approximately 400-500 kW for conventional fuel. The boiler room by the principle of action is a fire tube with a powerful convective beam, the pipe part of which is made in heavy brickwork with fireclay bricks. The design of the boiler room in the drawing is not disclosed in view of fame. Temperature control in a single drying chamber is carried out with the help of a frequency regulator dosing air blowing into the boiler combustion chamber. In an embodiment of two or more chambers, temperature control is carried out through a frequency drive of the heat supply pump.

The main heat loss of the drying method is the supply and exhaust ventilation and boiler plant efficiency. Heat losses through all camera enclosures make up no more than 4% of the installed heat capacity

boiler. The economizer is installed to reduce the temperature of flue gases and preheat the air forced into the furnace, as well as to control the ventilation rate in the boiler room.

The supply and exhaust system 9, due to the peculiarities of the location and design of the windows, provides a high averaged uniformity of the parameters of the drying agent and, as a result, the uniform distribution of moisture in the dried products.

Automatic control of the camera is performed by a microcontroller that controls and holds the drying parameters in accordance with the mode map. On the front panel of the control panel there are light indicators and manual control switches.

Thus, the effectiveness of this proposal lies in the design and technological solution of modular construction of finished containers of technological drying complexes. The use of a double-ring vertical air circulation formed by a heat ventilation unit allows loading not one but two block-stacks of lumber into one drying chamber, doubling the useful capacity of the installation, and, accordingly, its productivity.

If necessary, the applicant can provide more complete data on the nature and effectiveness of this proposal.

LITERATURE

1.N.N. Peich, Z.V. Boronenko. Handbook of wood drying. M .: Forest industry, 1966, - 272 p.

2. Handbook of wood drying. Ed. E.S. Bogdanova. M .: Forest industry, 1990, 304 s.

3. Krechetov IV. Drying of wood. M .: Forest industry, 1980.-432 p.

4. Wood handbook - Wood as an engineering material. Gen. Tech. Rep.FPL-GTR-113. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 1999 - 463 p.- prototype ch.12, p.9.

5. C.M. Wolfe et al. US 4182048

6. J.I. Charter et al. US 5226244

7. RU 2047064, F26B 7/00, 1995.

8. SU 1200097, F26B 7/00, 1985.

9. SU 505862, F26B 7/00, 1973.

Claims (2)

1. Technological drying complex containing a drying chamber, building structures, heat insulating elements and pumping equipment, characterized in that it is equipped with a heat ventilation unit forming a double-ring vertical air circulation and forced supply and exhaust ventilation due to its location in the drying chamber between the block stacks of the processed material, while containers used for building structures and heat-insulating elements are two in two so that the space between them forms the loading volume of the drying chamber, and pumping and boiler equipment are placed in their internal premises. 2. Technological drying complex according to claim 1, characterized in that it is made in the form of dialable modular elements.